US20100171272A1 - Piston ring - Google Patents

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US20100171272A1
US20100171272A1 US12/664,462 US66446208A US2010171272A1 US 20100171272 A1 US20100171272 A1 US 20100171272A1 US 66446208 A US66446208 A US 66446208A US 2010171272 A1 US2010171272 A1 US 2010171272A1
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Prior art keywords
wear
piston ring
resistant coating
accordance
layer
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US8273469B2 (en
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Steffen Hoppe
Manfred Fischer
Christiane Bauer
Ralf Lammers
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Federal Mogul Burscheid GmbH
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Assigned to WILMINGTON TRUST, NATIONAL ASSOCIATION, AS COLLATERAL TRUSTEE reassignment WILMINGTON TRUST, NATIONAL ASSOCIATION, AS COLLATERAL TRUSTEE CONFIRMATORY GRANT OF SECURITY INTERESTS IN UNITED STATES PATENTS Assignors: BECK ARNLEY HOLDINGS LLC, CARTER AUTOMOTIVE COMPANY LLC, CLEVITE INDUSTRIES INC., FEDERAL-MOGUL CHASSIS LLC, FEDERAL-MOGUL FILTRATION LLC, FEDERAL-MOGUL FINANCING CORPORATION, FEDERAL-MOGUL IGNITION LLC, FEDERAL-MOGUL MOTORPARTS LLC, FEDERAL-MOGUL PISTON RINGS, LLC, FEDERAL-MOGUL POWERTRAIN IP LLC, FEDERAL-MOGUL POWERTRAIN LLC, FEDERAL-MOGUL PRODUCTS US LLC, FEDERAL-MOGUL SEVIERVILLE, LLC, FEDERAL-MOGUL VALVETRAIN INTERNATIONAL LLC, FEDERAL-MOGUL WORLD WIDE LLC, FELT PRODUCTS MFG. CO. LLC, F-M MOTORPARTS TSC LLC, F-M TSC REAL ESTATE HOLDINGS LLC, MUZZY-LYON AUTO PARTS LLC, TENNECO AUTOMOTIVE OPERATING COMPANY INC., TENNECO GLOBAL HOLDINGS INC., TENNECO INC., TENNECO INTERNATIONAL HOLDING CORP., THE PULLMAN COMPANY, TMC TEXAS INC.
Assigned to FEDERAL-MOGUL POWERTRAIN LLC, FELT PRODUCTS MFG. CO. LLC, TENNECO AUTOMOTIVE OPERATING COMPANY INC., TENNECO INTERNATIONAL HOLDING CORP., FEDERAL-MOGUL FINANCING CORPORATION, F-M MOTORPARTS TSC LLC, TENNECO GLOBAL HOLDINGS INC., FEDERAL-MOGUL POWERTRAIN IP LLC, FEDERAL-MOGUL VALVE TRAIN INTERNATIONAL LLC, FEDERAL-MOGUL MOTORPARTS LLC, THE PULLMAN COMPANY, TENNECO INC., BECK ARNLEY HOLDINGS LLC, FEDERAL-MOGUL PRODUCTS US LLC, CARTER AUTOMOTIVE COMPANY LLC, FEDERAL-MOGUL PISTON RINGS, LLC, F-M TSC REAL ESTATE HOLDINGS LLC, FEDERAL-MOGUL FILTRATION LLC, CLEVITE INDUSTRIES INC., FEDERAL-MOGUL SEVIERVILLE, LLC, FEDERAL-MOGUL WORLD WIDE LLC, TMC TEXAS INC., FEDERAL-MOGUL CHASSIS LLC, MUZZY-LYON AUTO PARTS LLC, FEDERAL-MOGUL IGNITION LLC reassignment FEDERAL-MOGUL POWERTRAIN LLC RELEASE BY SECURED PARTY (SEE DOCUMENT FOR DETAILS). Assignors: WILMINGTON TRUST, NATIONAL ASSOCIATION
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Classifications

    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C14/00—Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material
    • C23C14/06—Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material characterised by the coating material
    • C23C14/0641—Nitrides
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C14/00—Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material
    • C23C14/0021—Reactive sputtering or evaporation
    • C23C14/0036—Reactive sputtering
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C14/00—Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material
    • C23C14/22—Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material characterised by the process of coating
    • C23C14/24—Vacuum evaporation
    • C23C14/32—Vacuum evaporation by explosion; by evaporation and subsequent ionisation of the vapours, e.g. ion-plating
    • C23C14/325—Electric arc evaporation
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16J—PISTONS; CYLINDERS; SEALINGS
    • F16J9/00—Piston-rings, e.g. non-metallic piston-rings, seats therefor; Ring sealings of similar construction
    • F16J9/26—Piston-rings, e.g. non-metallic piston-rings, seats therefor; Ring sealings of similar construction characterised by the use of particular materials
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/26—Web or sheet containing structurally defined element or component, the element or component having a specified physical dimension
    • Y10T428/263—Coating layer not in excess of 5 mils thick or equivalent
    • Y10T428/264—Up to 3 mils
    • Y10T428/265—1 mil or less

Definitions

  • the invention concerns a piston ring in accordance with the principal concept of Claim 1 .
  • Piston rings are provided with wear protection layers on their running surfaces and/or ring flanges, in order to achieve the required life span.
  • High cylinder pressures, direct injection, exhaust gas recycling, and other design features in recent engine developments, as well as alternative cylinder materials make increasing demands on piston rings.
  • Wear resistant layers are applied by means of thermal spraying processes, plating processes or thin layer technologies, and where required, are further processed through heat treatments or diffusion processes. Normally, the layers are substantially homogenous, and are therefore applied in an unstructured form. The wear resistance is adjusted through the corresponding hardness of the material.
  • a plated hard chrome layer which possesses crevices, in which are embedded diamond particles with a size of 0.25 to 0.5 ⁇ m.
  • further particles of hard materials consisting of tungsten carbide, chrome carbide, aluminium oxide, silicon carbide, silicon nitride, boron carbide or boron nitride can be embedded in the crevices.
  • this layer also possesses good emergency operating characteristics, in particular due to the conversion of diamond into graphite at temperatures of approx. 700° C. or higher.
  • U.S. Pat. No. 5.549.086 discloses piston ring coatings in TiN and CrN.
  • German DE 10 2004 032 403 B3 describes piston rings, which possess a graded CrN coating over a chrome adhesion layer, such coating having a nitrogen content which increases towards the outside.
  • piston rings for combustion engines which are provided with a multiple layer coating system, the individual layers of which possess the same metallic components, and which only vary in their nitrogen content.
  • the layer thicknesses of the individual layers are given as ⁇ 1 ⁇ m.
  • the layers are applied by means of a PVD process, in particular an arc process.
  • Lamni et al. J. VrC. Technol. A23 (4), 2005 Page 593 ff describes the microstructures and the nano-hardness of layers consisting of the three-component material systems Zr—Al—N and Zr—Cr—N.
  • the layers are applied by magnetron sputtering, and have a thickness of 1 ⁇ m.
  • Zri 1-x Cr x N within the range of 0 ⁇ x ⁇ 0.48 no change in the nano-hardness was detected.
  • the wear-resistant coating consists of a three-component material system A-B—N, which is applied by means of a PVD process, in which A and B are each an element from the group Ti, Zr, Hf, V, Nb, Ta, Cr, Mo, W, Al, Si and C where A ⁇ B and N is nitrogen and where the thickness of the wear-resistant coating >3 ⁇ m.
  • PVD process includes the technologies listed below, as well as reactive variants of these processes:
  • the wear-resistant coating consists of a three-component system on the basis CrN.
  • the thickness of the wear-resistant coating is 5 to 60 ⁇ m ⁇ m, particularly with 5 to 15 ⁇ m and 25 to 35 ⁇ m.
  • the thickness of the wear-resistant coating is 3 to 4 ⁇ m, particularly 3.2 to 3.7 ⁇ m or 5 to 7 ⁇ m, and especially for 5.7 to 6.5 ⁇ m and 10 to 14 ⁇ m, especially 11 to 13 ⁇ m.
  • the wear-resistant coating is preferably applied by means of a reactive arc process (Arc-PVD).
  • Arc-PVD reactive arc process
  • multi-layer coatings (with an adhesion layer of chrome) were deposited using a reactive arc process. These were nitrided piston rings in a high alloy steel.
  • the wear-resistant coatings consisted of different compositions of the systems Cr—V—N, Cr—Zr—N and Cr—Ti—N. Three different compositions were investigated in each case.
  • the following tables list the coating thicknesses and the coating hardnesses.
  • these prepared piston rings were subjected to representative tests under lubricated, reciprocating, sliding, and loading.
  • the mating surface in each case consisted of a segment of a cylinder guide in cast iron (GOE 300, material of the applicant).
  • a synthetic ester without additives was used as a lubricant.
  • the representative tests A and B differ in the stroke length. Representative test A was carried out with a longer stroke.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • General Engineering & Computer Science (AREA)
  • Physical Vapour Deposition (AREA)
  • Pistons, Piston Rings, And Cylinders (AREA)

Abstract

Disclosed is a piston ring comprising a supporting material and a wear-resistant coating. The wear-resistant coating is composed of a ternary system A-B—N which is applied using a PVD process and in which A and B each represent an element form the group encompassing Ti, Zr, Hf, V, Nb, Ta, Cr, Mo W, Al, Si and C, wherein A ≠B and N represents nitrogen. The thickness of the wear-resistant coating amounts to ≧3 μm.

Description

  • The invention concerns a piston ring in accordance with the principal concept of Claim 1.
  • Piston rings are provided with wear protection layers on their running surfaces and/or ring flanges, in order to achieve the required life span. High cylinder pressures, direct injection, exhaust gas recycling, and other design features in recent engine developments, as well as alternative cylinder materials make increasing demands on piston rings.
  • Wear resistant layers are applied by means of thermal spraying processes, plating processes or thin layer technologies, and where required, are further processed through heat treatments or diffusion processes. Normally, the layers are substantially homogenous, and are therefore applied in an unstructured form. The wear resistance is adjusted through the corresponding hardness of the material.
  • All forms of phenomena which indicate thermal overload on the surface of the piston ring are typically grouped under the concept of scorch marks.
  • From DE 199 31 829 A1 there is known a plated hard chrome layer, which possesses crevices, in which are embedded diamond particles with a size of 0.25 to 0.5 μm. In addition, further particles of hard materials consisting of tungsten carbide, chrome carbide, aluminium oxide, silicon carbide, silicon nitride, boron carbide or boron nitride can be embedded in the crevices.
  • When high temperatures occur, the diamond particles are converted into graphite, which then assumes the function of a lubricant, and therefore prevents the formation of scorch marks. Thus, this layer also possesses good emergency operating characteristics, in particular due to the conversion of diamond into graphite at temperatures of approx. 700° C. or higher.
  • In order to make further improvements in the scorch mark behaviour of piston rings, layers of materials have hitherto typically been used, which have very high melting points, and which consequently need very high temperatures in order to cause their thermal overload. A typical example for these is chrome nitride, which is applied by means of a PVD process, and has a decomposition temperature of approx. 2,000 K.
  • In order to improve resistance to scorch marks and wear resistance, there is proposed in DE 10 2004 028 486 A1 a coating of several individual layers, which consist alternately of chrome and chrome nitride. The chrome nitride layers may consist of CrN, Cr2N or mixtures thereof. In order to avoid abrupt transitions, the coating process is so controlled that the individual layers of chrome nitride each possess a border of Cr2N and a core of CrN. Each individual layer is at least 0.01 μm thick. The maximum thickness is 10 μm. The total thickness of the coating is given as 5 to 100 μm.
  • U.S. Pat. No. 5.549.086 discloses piston ring coatings in TiN and CrN.
  • German DE 10 2004 032 403 B3 describes piston rings, which possess a graded CrN coating over a chrome adhesion layer, such coating having a nitrogen content which increases towards the outside.
  • From JP 2005-060810 A there are known piston rings for combustion engines, which are provided with a multiple layer coating system, the individual layers of which possess the same metallic components, and which only vary in their nitrogen content. The layer thicknesses of the individual layers are given as <1 μm. The layers are applied by means of a PVD process, in particular an arc process.
  • However, the resistance to scorch marks of the known layers is not satisfactory.
  • Lamni et al. J. VrC. Technol. A23 (4), 2005 Page 593 ff describes the microstructures and the nano-hardness of layers consisting of the three-component material systems Zr—Al—N and Zr—Cr—N. The layers are applied by magnetron sputtering, and have a thickness of 1 μm. With respect to the three-component material system Zri1-xCrxN within the range of 0≦x≦0.48 no change in the nano-hardness was detected.
  • It is the purpose of the invention to disclose a piston ring with a wear-resistant coating, which possesses a high degree of wear resistance.
  • This purpose is achieved by means of a piston ring which is thereby characterized that the wear-resistant coating consists of a three-component material system A-B—N, which is applied by means of a PVD process, in which A and B are each an element from the group Ti, Zr, Hf, V, Nb, Ta, Cr, Mo, W, Al, Si and C where A≠B and N is nitrogen and where the thickness of the wear-resistant coating >3 μm.
  • It has been shown that when compared with a two-component system A-N, such as, for example, CrN, the presence of a further element from the group B permits the adjustment of the hardness over a wide range in a simple manner. This makes it possible to adjust the required hardness for the particular requirements of an application in an engine.
  • The group of PVD process includes the technologies listed below, as well as reactive variants of these processes:
      • Vaporization processes
        • Thermal vaporization (also known as evaporation)
        • Electron beam evaporation
        • Pulsed Laser Deposition, Pulsed laser ablation: Atoms and ions are evaporated by means of a short intensive laser pulse.
        • Arc-PVD evaporation: Atoms and ions are released from the source material and converted into a gaseous phase by means of a powerful current, which flows between two electrodes in an electric discharge.
        • Molecular beam epitaxy
          • Sputtering (Sputter deposition, cathodic atomization): The source material is atomized by means of ion bombardment and is converted into the gaseous phase.
          • Ion plating
  • Preferably the wear-resistant coating consists of a three-component system on the basis CrN.
  • One wear-resistant layer is preferred consisting of Zr1-xCrxNy in which x=0.1 to 0.85 and y=0.5 to 1, and in particular where x=0.22 to 0.82 and y=0.94 to 0.98. The range in which x=0.44 to 0.85 and y=0.8 to 1 is particularly preferred.
  • Further preferred three-component systems are V1-xCrxNy and Ti1-x, CrxNy
  • Preferably, the wear-resistant coating consists of V1-x, CrxNy where x=0.85 to 0.10 and y=0.5 to 1, and particularly where x=0.3 to 0.8 and y=0.5 to 1.
  • Furthermore, preference is given to the system Ti1-x, CrxNy where x=0.10 to 0.85 and y=0.5 to 1, particularly where x=0.6 to 1 and y=0.5 to 1.
  • Preferably, the thickness of the wear-resistant coating is 5 to 60 μm μm, particularly with 5 to 15 μm and 25 to 35 μm.
  • Preferably, the thickness of the wear-resistant coating is 3 to 4 μm, particularly 3.2 to 3.7 μm or 5 to 7 μm, and especially for 5.7 to 6.5 μm and 10 to 14 μm, especially 11 to 13 μm.
  • The wear-resistant coating is preferably applied by means of a reactive arc process (Arc-PVD). The advantage of this process lies in the fact that, in contrast to sputter processes, a higher basic hardness can be set. This is due to the different structural texture of the wear-resistant coating.
  • When considering three-component systems, it should be borne in mind that it is possible that small quantities of oxygen and other impurities are contained within the three-component system. The magnitude of the oxygen proportion is up to 5 at %.
    • EXAMPLES
  • In order to prevent wear on piston rings, multi-layer coatings (with an adhesion layer of chrome) were deposited using a reactive arc process. These were nitrided piston rings in a high alloy steel. The wear-resistant coatings consisted of different compositions of the systems Cr—V—N, Cr—Zr—N and Cr—Ti—N. Three different compositions were investigated in each case.
  • The following tables list the coating thicknesses and the coating hardnesses. In order to check the wear-resistance, these prepared piston rings were subjected to representative tests under lubricated, reciprocating, sliding, and loading. The mating surface in each case consisted of a segment of a cylinder guide in cast iron (GOE 300, material of the applicant). In order to reduce the timescale, a synthetic ester without additives was used as a lubricant. The representative tests A and B differ in the stroke length. Representative test A was carried out with a longer stroke.
  •
    Layer Hardness
    Cr—(V—)N Cr—V—N (Cr—)V—N
    HV 0.1 2135 2122 2394
    V-content at % 14.2 31 44.7
    Cr-content at % 41 23.3 8.7
    N-content at % 42.8 44.5 45.6
    Model test A Wear
    Ring μm 1 0 1
    Mating body μm 67.5 76 55.5
    Layer μm 5.7 5.7 6.5
    thicknesses
    Layer Hardness
    Cr—(Zr—) N Cr—Zr—N (Cr—)Zr—N
    HV 0.1 1855 2025 2392
    Zr-content at % 12 27 40
    Cr-content at % 41 24 11
    N-content at % 48 47 47
    Model test A Wear
    Ring μm 2.5 3.5 3
    Mating body μm 75 53.5 60
    Layer μm 3.2 3.2 3.7
    thicknesses
    Layer Hardness
    Cr—(Ti—)—N Cr—Ti—N (Cr—)Ti—N
    HV 0.05 1502 1977 2246
    Ti-content at % 12 23 40
    Cr-content at % 43 32 13
    N-content at % 43 40 43
    0-content at % 2 5 4
    Model test B Wear
    Ring μm 1.25 1 1
    Mating body μm 9 7 4
    Layer μm 11 12 13
    thicknesses
  • The presence of an additional metal in CrN layers influences the layer properties. With a higher proportion of the added metal (Vanadium, Zirconium or Titanium) the hardness can be increased. These innovative layers make it possible to adjust the required hardness of a particular application in an engine.
  • Furthermore it is possible, on the basis of the composition of the PVD layers, to adjust the wear performance of the PVD layer and of the cylinder mating surface sometimes over very wide ranges. One of the most important characteristics of the piston ring, the wear-resistance of the running surface can be optimised and adjusted using these innovative layers. It is now possible in the field of rings for large pistons to correspond in nuances with the requirements for the wear of the piston and of the cylinder mating surface. For example, in the field of rings for large pistons, a lower wear of the cylinder running surface is called for, so that during maintenance only the ring needs to be changed, instead of changing the cylinder liner, which is very expensive and complicated to replace. On the other hand, in the field of passenger car engines, it is expected that the paring of piston ring/cylinder mating surface will overall still offer minimal wear and therefore good exhaust gas values, even after high operating performance.

Claims (13)

1. A piston ring with a support material and a wear-resistant coating, wherein,
the wear-resistant coating consists of a three-component system A-B—N applied by means of a PVD process, in which
A and B are each an element from the group Ti, Zr, Hf, V, Nb, Ta, Cr, Mo, W, Al, Si and C in which A≠B and N is nitrogen, and the thickness of the wear-resistant coating is ≧3 μm.
2. A piston ring in accordance with claim 1, wherein the three-component system consists of A-Cr—N.
3. A piston ring in accordance with claim 1, wherein the wear-resistant coating consists of Zr1-xCrxNy where x=0.1 to 0.85 and y=0.5 to 1.
4. A piston ring in accordance with claim 3, wherein the wear-resistant coating consists of Zr1-xCrxNy where x=0.44 to 0.85 and y=0.8 to 1.
5. A piston ring in accordance with claim 1, wherein the wear-resistant coating consists of V1-xCxNy where x=0.85 to 0.1 and y=0.5 to 1.
6. A piston ring in accordance with claim 5, wherein x=0.3 to 0.8 and y=0.5 to 1.
7. A piston ring in accordance with claim 1, wherein the wear-resistant coating consists of Ti1-xCrxNy where x=0.1 to 0.85 and y=0.5 to 1.
8. A piston ring in accordance with claim 7, wherein x=0.6 to 0.1 and y=0.5 to 1.
9. A piston ring in accordance with claim 1, wherein the thickness of the wear-resistant coating is 5 to 60 μm.
10. A piston ring in accordance with claim 9, wherein the thickness of the wear-resistant coating is 5 to 15 μm.
11. A piston ring in accordance with claim 9, wherein the thickness of the wear-resistant coating is 25 to 35 μm.
12. A piston ring in accordance with claim 1, wherein the wear-resistant coating is applied by means of a reactive arc process.
13. A piston ring in accordance with claim 1, wherein the support material consists of steel or a cast iron material.
US12/664,462 2007-06-13 2008-06-12 Piston ring Active 2029-05-28 US8273469B2 (en)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DE102007027245 2007-06-13
DE102007027245.8 2007-06-13
DE102007027245.8A DE102007027245B4 (en) 2007-06-13 2007-06-13 piston ring
PCT/EP2008/057411 WO2008152104A1 (en) 2007-06-13 2008-06-12 Piston ring

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US20100171272A1 true US20100171272A1 (en) 2010-07-08
US8273469B2 US8273469B2 (en) 2012-09-25

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JP (1) JP2010529389A (en)
DE (1) DE102007027245B4 (en)
WO (1) WO2008152104A1 (en)

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US20120126488A1 (en) * 2009-07-01 2012-05-24 Mahle Metal Leve S/A Piston ring
US20150211635A1 (en) * 2014-01-29 2015-07-30 Asimco Shuanghuan Piston Ring (Yizheng) Co., Ltd. Multilayer multi-element composite hard pvd coating on the surface of a piston ring, a piston ring and a preparation process
CN104838182A (en) * 2012-12-07 2015-08-12 株式会社理研 Piston ring
US20170009331A1 (en) * 2011-11-30 2017-01-12 Hyundai Motor Company Method and apparatus for forming coating layer with nano multi-layer
US10030773B2 (en) 2016-03-04 2018-07-24 Mahle International Gmbh Piston ring
US10697543B2 (en) 2014-07-16 2020-06-30 Federal-Mogul Burscheid Gmbh Sliding element, in particular piston ring, and method for producing the same
CN112628381A (en) * 2020-12-02 2021-04-09 东南大学 Temperature self-adaptive lubricating gear and preparation method thereof
US11155914B2 (en) * 2016-04-07 2021-10-26 Oerlikon Surface Solutions Ag, Pfäffikon Wear and/or friction reduction by using molybdenum nitride based coatings

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MX2015005048A (en) * 2012-10-22 2015-12-01 Ihi Ionbond Ag Fatigue- resistant coating for metal forming members.
BR102013031138B1 (en) 2013-12-03 2020-10-27 Mahle International Gmbh piston ring
US11162586B2 (en) 2017-06-02 2021-11-02 Mahle International Gmbh Piston ring and method of manufacture
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US11047478B2 (en) 2017-06-02 2021-06-29 Mahle International Gmbh Piston ring and method of manufacture
WO2019045520A1 (en) * 2017-08-31 2019-03-07 한국생산기술연구원 Piston ring with low-friction coating film and manufacturing method therefor
US11365806B2 (en) 2019-09-09 2022-06-21 Tenneco Inc. Coated piston ring for an internal combustion engine

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